Martin etal	def. pub.
process for manufacturing spandex type yarn



g pl

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Apr.11, 1968, 849 O.G. 1221. Identification is by serial number of theapplication and the heading indicates the number of pages ofspecification, including claims, and of sheets of drawing contained inthe application as originally filed. The file of this application isavailable to the public for inspection; reproduction may be purchasedfor 30 cents per sheet.

Applications published under the Defensive Publication Program have notbeen examined as to the merits of alleged invention. The Patent Officemakes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED MAY 27, 1969 PROCESS FOR MANUFACTURING SPANDEX TYPE YARNEmmett V. Martin and Colquitt H. Chapman, both of R0. Box 511,Kingsport, Tenn. 37662 Continuation of application Ser. No. 656,716,July 28, 1967. This application Feb. 17, 1969. Published May 27, 1969Int. Cl. D01d /12; D01f 7/06; D02g 3/32 U.S. Cl. 264-205 2 SheetsDrawing. 29 Pages Specification A process is disclosed for manufacturingspandex yarn which includes extruding a spinning dope of segmentedelastomer through a spinneret plate having a plurality of orificeshaving a length to diameter ratio of 5 to 200, causing an air stream,preferably at a temperature of from C. to 150 C., to flow across theface of the spinneret plate as the dope is extruded therethrough, andthen curing the bundle of filaments thereby obtained by contacting thebundle with a hot gaseous medium which may be at a temperature of from150 C. to 300 C. The bundle of filaments also may be coalesced into amultifilament yarn and may be heat treated at a temperature of from C.to 250 0., preferably C. to 180 C., at an exposure time of 0.02 secondto 24 hours, preferably 0.1 second to 1 minute, while stretching saidyarn from about 1.1 to about 6.0 times, preferably 1.25 to 4.50 times.The spandex yarn properties may be improved by exposing it to a Watermedium, for example, a controlled atmosphere between about 40% and about75% relative humidity at a temperature between about 20 C. and about 75C.

W rrgle SN 8O27 l8 A T TORNE Y5 y 1969 E. v. MARTIN ET AL DEF. PUB.

PROCESS FOR MANUFACTURING SPANDEX TYPE YARN Sheet Filed Feb. 17, 1969 NA m m w A T 0 W x a y 3 3 wmw a 7 a H .F ml V n UT E m M 0 M CE QZ 17mSN 802m May 27, 1969 EQV. MARTIN E'II'AL DYEF. PUB.

PROCESS FOR MANUFACTURING SPANDEX TYPE YARN Fn a Rem-17, 1969 Sheet g,of 2 COLQUITT H. CHAPMAN 1 EMMETT V. MARTIN a A TTOR/VE YS

